|  | osso | The library context as returned by osso_initialize. | 
    |  | name | the name of the applet that should receive the event. | 
    |  | argument1 | This is the first argument of the event. It's interpretation depends on event_type. | 
    |  | argument2 | This is the second argument of the event. It's interpretation depends on event_type. | 
    |  | argument3 | This is the third argument of the event. It's interpretation depends on event_type. NULL can be used here. | 
    |  | retval | This parameter will be used to store possible return data of the call. If NULL, no data will be expected (and the return value is unreliable). You should call osso_rpc_free_val for this structure when it is no longer needed. |